I guess I just look back at history when they say they want every citizen to register every gun.
First example, look at the Nazi Weapon Act of 1938
Classified guns for "sporting purposes".
All citizens who wished to purchase firearms had to register with the Nazi officials and have a background check.
Presumed German citizens were hostile and thereby exempted Nazis from the gun control law.
Gave Nazis unrestricted power to decide what kinds of firearms could, or could not be owned by private persons.
The types of ammunition that were legal were subject to control by bureaucrats.
Juveniles under 18 years could not buy firearms and ammunition.
Shortly after they started confiscating all firearms, sure they mainly targeted the Jewish citizens.
Not only did Hitler do this, Stalin followed the same premise very closely
There's an old saying that goes something like
those who don't learn from the past are doomed to repeat it
The thing that makes it bad, is because it makes it easier for the government to come along and look at what guns everyone has. Then if they see one gun in particular that they don't like and sees there is a large population of people that own it, they can send authorities to their home and confiscate it.
Why shouldn't the government be able require us to registrar guns but be able to require for cars? Our ownership of guns is a right, driving is a privilege.
Sure I don't see a mass confiscation happening, but why give them what they need to make it easy?
Oh, and if they were to pass a bill saying I have to register all my firearms that meet the listed criteria, I will be bringing in my BB gun to show them how ridiculous it is. I looked at my BB gun the other night, not only does it hold more than 10 rounds, it also has what could be considered a "thumb hole stock"